Latch



29, 1939- F. w. EJDEVERELL 2,171,174

LATCH Filed Nov. 25, 1938 2 Sheets-Sheet 1 I" .4. I M ,fiwenzz ,JF'ME DevereZL Q 1939. F. w. E. DEVERELL 2,171,174

LATCH Filed Nov. 25, 1938 2 Sheets-Sheet 2 .5 1 e a 5 4 5:; 56

54 J fizz/444M j IUD-4': 11

l I a E W 5 DE ELL ENTOR Patented Aug. 29, 1939 UNITED STATES PATENT OFFICE LATCH Application November 25, 1938, Serial No. 242,400

In New Zealand I 11 Claims.

This invention relates to latches or looks of the kind in which the main latch bolt is normally retracted, but its projection brought about by a member which contactswith a striking surface on the jamb or frame and which is thereby given a movement which actuate's means to move the latch into engaged position.

According to the present invention, the main latch bolt is slideably mounted in a casing, while a striking member is also slideable in the casing in such a manner that upon a bevelled end thereof contacting with the striking surface, such member is moved inwardly and actuates means to initially project forward the main latch bolt. The

' full outward projection of. the latter is completed by the movement of a complementary actuating and retaining member, pivoted to the latch bolt and guided in such a manner that when it is brought to a predetermined position by the initial projection of the latch bolt, then such actuating member, by gravity or spring tension, will make a movement and complete the projection of the latch bolt without in any way actuating the striking bolt. When the latch is to be opened, the actuating member is operated by handle means and will partially retract the latch bolt, the final retraction being completed and the resetting of the striking bolt being obtained by the opening movement of the door.

The invention will be described with the aid of the accompanying drawings, wherein:

Figure 1 is an elevation of the lock with a part of the casing removed, showing the parts of the lock in normal position.

Figure 2 is a sectional plan on line AA Figure 1. Y

Figure 3 is a part sectional plan on line B-B Figure 1.

Figure 4 is a cross-section on line CC Figure 1.

Figure 5 is an elevation similar to Figure 1 but showing the parts operated to the position when the door is closed.

Figure 6 is a sectional plan on line DDFigure 5.

Figure '7 is a sectional plan on line E-E Figure 8 below.

Figure 8 is an elevation ofthe lock showing the position of the parts when the lock is being operated for opening.

Referring to the drawings, the striking bolt I is guided for forward and rearward movement in the casing 2 by means of tongues 3 and a slot 4 in which passes a pin 5 fixed in the casing. A lever B is fulcrumed on a pin- I fixed in the December 23, 1937 casing and has a slotted end 8 in. which works a pin 9 projecting from the side of the striking bolt. The other end of the lever depends downwardly and has a forked end consisting of members it) and I I. The fulcrum of the lever B is such as to allow its forked lower end to have a greater throw than its other end. Into the fork a pin I2 projects: laterally from the main latch bolt l3, which is guided between two tongues IA of the casing and on a pin I5 passing through a slot It in the bolt. The members I!) and l I of the lever B are spaced apart and arranged so that the member II will, in the normal inoperative position. of the latch, as in Figure 1, rest against the pin I2 from such latch bolt so that upon the re tirement of the striking bolt I, forward projectory movement will be immediately imparted to the latch bolt I3, but when further projection of the latch bolt continues, such bolt will be free Q to move forward without operating the lever G. The latch bolt is bevelled at H on the side re mote from the usual striking side.

An actuating and retaining member l8, here inafter referred to as the member I 8, is pivoted on the pin I2 from the latch bolt and extends rearwardly and has a slot is through which passes a pin fixed in the casing. The slot is in the member I3 has its rear part 21 at an angle to the part 28 and finally ends in a short slot 22 at right angles thereto tofall over the pin 26 upon the final projection of the latch bolt IE5 in order to retain themember it against any return movement and, therefore, retain the latch bolt in its projected position. The member I8 to the rear end of the slot has a weighted end 23 and contains a tooth or projection 24 which, when the member I8 is in its downward position with the bolt I3 fully projected, as in Figure 5, can be engaged by a projection or tooth 25 on a handle socket 26 pivoted in the casing.

This handle socket 26 may be provided with the usual form of square bar 27 passing through the door and having handles 28 (see Figure 7). The socket also has a weight 3!! so that the projection 25 thereon normally falls into operative position as in Figure 1.

A latch plate 3| on-the door jamb 32 has a striking member 33 projecting from it and also has a slot M to receive the latch bolt. A portion is cut away from the casing at 37 (see Figure 2) to clear the member 33 and allow it to contact with the bolt I. The striking bolt I may instead project from the face of the casing, in which case the striklngmember 33 could be flush with the surface of the jamb and the cut away portion 31 would not be required.

The striking bolt I has its guide slot 4 ending in an upwardly inclined part 35 into which the guide pin 5 through the slot enters at the normal position of the striking bolt. When it is in this position, as shown in Figure l, the rear end of the bolt will be in a slightly downward position with a continuation 35 thereof engaging just in front of the weighted end 23 of the member It. In this position the pin 5 resting against the upper edge of the inclined part 35 of the slot 4 will be suiiicient to prevent the tendency of the latch bolt I3 and member I8 to movement outwards due to centrifugal action when the door is being swung on its hinges. When, however, the striking bolt has been struck by the projection 33, the edge of the part 35 will ride over the pin and the projection 36 will rise clear of the weighted end 23 and permit the member IE to move forward. The handle socket, instead of being weighted. may be actuated by a spring.

In operation, upon the closing of the door, the bevelled edge 38 of the striking bolt I strikes the striking member 33 of the jamb plate (H and the bolt I slides inwardly to the position shown in Figures 5, 6 and 8, carrying with it the lever B. This movement of the lever 6 causes the forked end of the lever 6 to move the latch bolt I3 and the weighted member I8 to the position shown in full lines in Figure 8, where the latch bolt is partly projected (see also Figure 7), the member I8 being in the position shown where the angular or upwardly sloping portion 2| of the slot I9 has reached the guide pin 26 from the casing. The weighted socket 26, however, has not moved, being still in the position shown in Figures 1 and 5 and in dotted lines in Figure 8. The weighted end 23 of the member I8 will now cause such member to slide downwardly on the pin 25 and carry forward the latch bolt I3 to its finally projected position, as in Figure 5, but by reason of the width between the forks It and I I, neither the lever 6 nor the striking bolt 1 are further actuated. The member I8 reaching the limit of its forward movement, the short angle slot 22 at the end of the slot I9 permits the weighted end of the member finally to fall a little lower without producing any further forward movement of the bolt I3 and into the position where the tooth or projection thereon can be engaged by the tooth or projection on the handle socket. This final movement in the short slot also prevents any rearward movement of the bolt I3 taking place until such time as the member is raised by means of the projection on the handle socket. To open the latch, rotation of the handle socket in the direction of the arrow in Figure 5 is made'by means of a handle 28 until the position in full lines in Figure 8 is reached, and this movement will cause the member I8 to move upwards and rearwards from the position shown in Figure 5 to the position shown in Figure 8, and carry back the latch bolt I3 until such time as the pin I2 therefrom reaches the rear member of the fork, as in Figure 8.

By referring to Figure 7, it will be seen that the bolt I3 will have been moved back to the position where the bevelled edge I! of the bolt rests against the edge of the opening in the jamb plate 3 I. Opening movement of the door will now cause the bolt to slide inwards to the position in Figure 1 and carry the lever 3 and striking bolt I to their original positions, as in Figure 1, the inner end of the bolt I by reason of the pin and slot assuming the position shown with the projection 36 engaging the edge of the weighted member.

What I claim is:

1. In a latch, a member adapted to be retired upon striking a face on the door-way, a latch bolt adapted to be initially projected upon the retirement of the said member, means connecting the member to the latch bolt so that the partial projection of the latch bolt will take place upon the retirement of said member, and means adapted to be brought to an operative position by the partial forward projection of the latch bolt to cause the final projection of said latch bolt.

2. In a latch, a striking bolt guided in a casing, said striking bolt adapted to be retired upon striking a striking member on a door-way, a latch bolt guided in the casing, means connecting the striking bolt to the latch bolt, said means upon retirement of the striking bolt giving the latch bolt an initial projected movement, and means adapted to be brought to an operative position by the initial projection of the latch bolt and then to operate and complete the projection of the said latch bolt and retain the latch bolt in its finally projected position.

3. In the latch as claimed in claim 2, an actuating member pivotally connected to the latch bolt which upon reaching its initial projected position said member is brought to a position where it can complete a movement for finally projecting said latch bolt, and means to return said member to the position where it will initially return the latch bolt and permit said latch bolt to be finally retracted and thereby re-setting the striking bolt.

4. In the latch as claimed in claim 2, a lever pivoted in the casing, one end of said lever pivotally connected to the striking bolt, the other end of said lever engaging the latch bolt so as to project the latch bolt to the initial projected position upon the retirement of the striking bolt but to permit the final projection of the latch bolt.

5. In the latch bolt as claimed in claim 2, an actuating member pivoted at one end to said latch bolt, the other end of said member being weighted, a pin projecting from the casing and'passing through a slot in said member to guide the member during the initial projection of the latch bolt, the slot having an extended portion to guide said member in a forward and downward direction after the initial forward projection of the latch bolt has taken place, and means on said member so that upon the operation of the latch handle said member is raised and moved upwards and inwards to actuate the latch bolt to its initial retracted position.

6. In the latch as, claimed in claim 2, said striking bolt having a slot, a pin projecting through the slot, the rear end of the slot curving upwards so that as the bolt moves rearwards the end thereof will be positively moved downwards and engage behind the said member and retain the latch bolt against outward movement.

'1. In the latch as claimed in claim 2, the latch bolt having a bevelled face on its opening side to contact with an opening in the door-way so that upon the initial retraction of the bolt pressure on the door will cause said bolt to further retract and reset the striking bolt and actuating member.

8. In a latch, a casing, a striking bolt guided by the casing and adapted to be retired upon striking a striking member on a doorway, a latch bolt guided by the casing, means connecting the striking bolt to the latch bolt, said means upon retirement of the striking bolt acting to give the latch 7 bolt an initial projected movement, and means adapted to be brought to an operative position by the initial projection of the latch bolt and then to operate and complete the projection of the latch bolt and retain it in its finally projected position, said connecting means comprising a lever pivotally mounted in the casing, one end of said lever being pivotally connected to the striking bolt, the other end of said lever engaging the latch bolt in such manner as to project the latch bolt to the initial projected position upon the retirement of the striking bolt but allowing the latch bolt to proceed to final projection while the lever remains stationary.

9. In a latch, a casing, a striking bolt guided by the casing, said striking bolt being adapted to be retired upon striking a striking member on a doorway, a latch bolt guided by the casing, means connecting the striking bolt to the latch bolt, said means upon retirement of the striking bolt being adapted to give the latch bolt an initial projected movement, means adapted to be brought to an operative position by the initial projection. of the latch bolt and then to operate and cause the projection of said latch bolt and retain it in its finally projected position, the last mentioned means comprising an actuating member connected at one end to said latch bolt, the other end of said member being weighted, a pin projecting from the casing and passing through a slot in said member to guide the member during the initial projection of the latch bolt, the slot having an extended portion to guide said member in a forward and downward direction after the initial forward projection of the latch bolt has taken place, a handle socket in the casing, a first projection movable with the socket, a second projection on said actuating member adapted to be engaged by said first projection to operate the member and return the latch bolt to its initial retracted position.

10. In a latch, a casing, a striking bolt guided by the casing, said striking bolt being adapted to be retired upon striking a striking member on a doorway, a latch bolt guided by the casing, means connecting the striking bolt to the latch bolt, said means upon retirement of the striking bolt being adapted to give the latch bolt an initial projected movement, means adapted to be brought to an operative position by the initial projection of the latch bolt and then to operate and cause the projection of said latch bolt and retain it in its finally projected position, the last mentioned means comprising an actuating member connected at one end to said latch bolt, the other end of said member being Weighted, a pin projecting from the casing and passing through a slot in said member to guide the member during the initial projection of the latch bolt, the slot having an extended portion to guide said member in a forward and downward direction after the initial forward projection of the latch bolt has taken place. the extended portion of the slot in said member ending in an upwardly extending notch so that the member can fall into a final downward position to retain the latch bolt in its finally projected position, a latch handle, and cooperating means on said member and handle whereby upon the operation of the latch handle said member is raised and moved upwards and in wards to return the latch bolt to its initial retracted position.

11. In a latch of the character described, a casing, a movable striking member guided by the casing and having a portion normally projecting from the casing adapted to strike an object ar ranged exteriorly of the casing to cause movement of the striking member into retracted position, a latch bolt guided by the casing, means operatively connecting the striking member to the bolt to cause the bolt to be moved into an initially projected position when the striking member is moved into retracted position, and auxiliary means cooperating with the last mentioned means to complete the projection of the latch bolt and retain it in its finally projected position.

FREDERICK WILLIAM EDWARD DEVERELL. 

